Devil May Cry 5 (DMC5) lets you unlock Infinite Devil Trigger. That’s the purple bar under your health that is used to activate special powers and transformations.
To Unlock Infinite Devil Trigger:
- Beat the game on Dante Must Die difficulty, this unlocks the “Super” costumes for each character
- Before a mission, select the “Super” costume to gain Infinite Devil Trigger
To unlock “Dante Must Die” you must have beaten the game first on Human or Devil Hunter which unlocks Son of Sparda difficulty. Then beat it once more on Son of Sparda. Dante Must Die is pretty tough but you can get through it if you farmed a lot of red orbs beforehand to pay for revives or simply use gold orbs that you can find and also buy from shops. These gold orbs let you revive, too.
After beating Dante Must Die the game will tell you “Super Nero”, “Super V”, “Super Dante” costumes have been unlocked. Before you start any mission you can always choose whether you’d like to take the Original skin or the Super skin that comes with Infinite Devil Trigger.
Worth noting: when using Infinite Devil Trigger you get a -80% Rank Decrease at the end of missions. This makes it impossible to earn S-Ranks so it locks you out of certain trophies and achievements in the game. Only use it for fun and to get through Hell and Hell difficulty more easily, but don’t equip it when going for high ranks.
You still need to reactivate Devil Form after it runs out, just the Devil Trigger gauge will refill infinitely.